So, the purpose of this video is to walk you through how easy it is to change the size on one of your paper trays. First, you open your paper tray. Then, these blue pushpins right here, you can pull this side out and then you can push this side to the left. There will be markers down here that'll let you know what size it coincides with. Now, once you have that snug against the paper, you can go ahead and close your paper tray. The brain of the copier will automatically know what size is in the tray.